Office of Technology Transfer – University of Michigan

Building Efficient Spectrum-Agile Devices for Dummies

Technology #5641

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Researchers
Kang G. Shin
Managed By
Drew Bennett
Associate Director - Software Licensing 734-615-4004

Wireless technologies are ubiquitous in consumer and enterprise electronics. New devices and multimedia applications demand an increasing amount of data to be transferred over wireless networks, in order to meet this demand wireless devices have to make efficient use of networks. Current commercially available Wireless LAN or WiFi devices can select a frequency during startup based on the frequency’s condition, but if conditions change afterwards, they are unable to switch frequency in response. This behavior locks the devices in suboptimal frequencies, reducing the efficiency of wireless network.

Dynamic spectrum shaping

Researchers in the Electrical Engineering and Computer Science at the University of Michigan in collaboration with researchers at Hewlett-Packard Labs have developed Rodin, a general per frame spectrum-shaping protocol that enables wireless devices to dynamically switch between frequencies or channels in response to congestion and interference by shaping their output signals to different frequencies. This switching can happen in between frames in order to maximize data transfer rates. This protocol will allow wireless devices to more efficiently use of all the radio frequencies available for data transmission, improving overall network speed and reducing interference problem from other devices. FPGA based Rodin devices can be attached to commercial off the shelf wireless devices in order to increase their performance. This technology will be key in capturing a sizeable part of the $23.6 billion Wireless LAN industry, which is expected to grow to $ 88 billion by 2015.

Applications • Wireless Networks • WiFi • WLAN

Advantages • Increased efficiency in wireless networks • Easy to incorporate into currently available devices • Quick and automatic synchronization between devices • Low delay between original and shaped wireless signal